MTD for Income Tax Self-Assessment 2026: Complete Guide for UK Sole Traders and Landlords

From 6 April 2026, UK sole traders and landlords with gross income over £50,000 must follow Making Tax Digital for Income Tax Self-Assessment (MTD ITSA). This means replacing the single annual Self-Assessment return with quarterly digital submissions to HMRC, using approved software.

Gross income from self-employment and property is combined to check eligibility expenses are not deducted first. So even if your profit is lower, your gross figures may still bring you within scope.

The change itself is simple. In practice, if income and expenses are not recorded regularly, each quarterly update becomes harder to prepare and more likely to be inaccurate.

Key Takeaways

• UK sole traders and landlords earning over £50,000 must follow MTD for Income Tax from 6 April 2026
• You will submit four quarterly updates to HMRC each year plus a final declaration, replacing the single Self-Assessment return
• HMRC calculates eligibility using gross income from self-employment and rental income before expenses are deducted
• You must use HMRC-compatible software to keep records and submit updates. Manual or paper records are not accepted
• Income and expenses must be recorded when they occur. You cannot wait until the end of the quarter to update your records
• Each late submission adds one penalty point to your account. Once you reach four points, HMRC charges a £200 fine. Every missed deadline after that adds another £200 charge
• MTD does not change your tax bill or how tax is calculated. It only changes how often you report your income and expenses to HMRC

How MTD for Income Tax Differs from Self-Assessment?

Under HMRC Self-Assessment, income was recorded once a year and filed by the January deadline.

But MTD requires records to be maintained throughout the year, with quarterly updates replacing the single year-end submission.

Key Differences

Aspect	Earlier approach (Self-Assessment)	Under MTD
When records are prepared	Often near the deadline	Expected to be ongoing
Nature of work	One consolidated exercise	Repeated smaller cycles
Error handling	Fixed once before filing	Issues show up repeatedly if not corrected
Dependency on memory	High (backtracking entries)	Low (records must exist already)

That distinction matters because:

• Delays are no longer contained to one deadline
• Poor records affect every quarter, not just year-end
• The effort shifts from calculation to maintenance

Who Needs to Follow MTD for Income Tax?

MTD for Income Tax is not starting for everyone at once. It depends on how much income you report.

Phase	Start Date	Income Threshold	Based On
Phase 1	6 April 2026	Over £50,000	2024–25 tax return
Phase 2	6 April 2027	Over £30,000	2025–26 tax return
Phase 3	6 April 2028	Over £20,000	2026–27 tax return

For April 2026, your 2024–25 income is used. If it is over £50,000, you must follow MTD from that point.

All income is added together when checking the threshold, including business and rental income. Once you are in, you usually stay in unless HMRC confirms otherwise. If your income is below the limit, you join later when it crosses the next threshold.

How to Register for MTD for Income Tax?

Registration is not automatic. Even if HMRC writes to notify you, you must actively sign up before 6 April 2026. If you miss this step, you cannot submit quarterly updates on time.

If your qualifying income was over £50,000 in 2024 to 2025, you need to sign up now.

Here is how to do it:

• Check you have a HMRC Government Gateway account. If you have filed Self-Assessment online before, you will already have one
• Choose MTD compatible software before signing up, as it is needed to connect with HMRC
• Sign in to your HMRC account and follow the steps to register for MTD for Income Tax
• Authorise your software so it can submit updates to HMRC
• If you use an accountant, they can complete the process for you if they are authorised

Exemptions from MTD for Income Tax

Not everyone above the threshold needs to follow MTD. HMRC allows some automatic exemptions and others that require an application.

Automatic Exemptions (no application needed)

• Income of £20,000 or less
• No National Insurance number
• Trustees or personal representatives
• Individuals unable to manage affairs due to health, with legal authority in place
• Certain specific cases such as ministers of religion or those claiming older allowances

Temporary Deferrals (until April 2027):

• Applies if your 2024–25 return includes specific claims or supplementary pages
• No application needed unless these were not included in your return

Exemptions You Must Apply for:

• If it is not reasonable to use digital tools due to age, health, disability, religious reasons or lack of internet access
• Not accepted for reasons like unfamiliarity with software, time or cost

Applications can be made through HMRC and existing VAT digital exclusion cases may not need a full reapplication.

How MTD for Income Tax Works?

Under MTD for Income Tax, reporting does not happen just once at the end of the year. It is spread across the year in a set pattern.

There are three parts to this process.

1. Keeping Digital Records

You need to keep a digital record of your income and expenses using software that works with HMRC.

This includes:

• Money coming in from your business or property
• Costs related to running that business or property

You can still use spreadsheets, but they must be connected to MTD-compatible software. If figures are copied manually between systems, that breaks the requirement.

This is where many setups fall short. The issue is not the software itself, but how the records are maintained.

2. Sending Quarterly Updates

You will send four updates to HMRC during the year. Each one covers a three-month period.

These updates include a summary of:

• Total income for that period
• Total expenses for that period

They are not final. You can still make corrections later.

If you update your records regularly during the quarter, each submission is easy to prepare. If everything is left until the deadline, each quarter takes longer and is difficult to complete accurately.

3. Submitting the Final Declaration

At the end of the tax year, you submit a final declaration.

This replaces the current Self-Assessment return. It includes:

• Final adjusted figures
• Any other income not reported in quarterly updates
• Claims and reliefs

This is where your final tax position is confirmed.

MTD ITSA Deadlines

Under MTD, you report income across four set periods during the year, followed by a final submission.

Quarter	Period	Deadline
Q1	6 April – 5 July 2026	7 August 2026
Q2	6 July – 5 October 2026	7 November 2026
Q3	6 October 2026 – 5 January 2027	7 February 2027
Q4	6 January – 5 April 2027	7 May 2027
Final Declaration	Full year	31 January 2028

Each quarterly update covers only that specific period. You are not reporting the full year each time.

There is also an option to follow calendar quarters, but this needs to be set before you begin and then used consistently.

Tax is still calculated annually. These updates do not change when you pay, only how often you report.

How Penalties Work Under MTD?

MTD uses a points-based system, which works differently from the older one-off penalty approach.

• Each time a quarterly update or final submission is late, one penalty point is added
• Once you reach the limit (for quarterly filers, typically 4 points), a £200 fine is charged
• After that, every further missed deadline leads to another £200 penalty until the record is cleared

Points don’t stay forever, but they don’t reset immediately either. To clear them, you need to:

• Submit all required returns on time for a set period
• Ensure there are no outstanding filings

This means:

• Missing one deadline won’t trigger a fine straight away
• Repeated delays build up points quietly in the background
• Once the limit is hit, penalties start applying automatically

What Counts as Qualifying Income?

MTD is based on your gross income from self-employment and property, not your total income from all sources.

Qualifying Income Means:

• Income from your trade or profession as a sole trader
• Rental income from UK or overseas property

These figures are taken before expenses are deducted.

Income that does not count towards the MTD threshold includes:

• Wages or salary taxed through PAYE
• Dividends from company shares
• Bank or savings interest

These are still reported in your final declaration, but they are ignored when HMRC decides whether you fall within MTD.

Preparing for April 2026

Most MTD problems come from how records are handled now, not the rules set by HMRC. If work is left until year-end, the same pressure will come up every quarter.

Keep records up to date. Delays, missing entries and last-minute changes will repeat during the year and make each submission harder.

The key change is timing. Instead of doing everything in January, spread the work across the year so updates stay simple and manageable.

When Can You Stop Using MTD?

Once you are in, falling below £50,000 does not automatically remove you. You can leave MTD only if HMRC confirms one of the following:

• Your income stays below the threshold for three consecutive tax years
• Your business and rental income both stop
• You are granted a digital exclusion exemption

If your income is close to the threshold, it is sensible to expect that MTD will continue.

Conclusion

MTD for Income Tax does not introduce new taxes or complex calculations. It changes when and how your records need to exist.

The real adjustment is moving away from delayed preparation to consistent record-keeping.

For those who already maintain organised records, the transition is manageable. For others, the challenge is not the system, but the shift in routine.

Outbooks supports UK firms with structured workflows and ongoing MTD reporting support. Call +44 330 057 8597 or email info@outbooks.co.uk to discuss your situation.

FAQs

Do quarterly updates replace the tax return completely?

Not entirely. Quarterly updates provide ongoing summaries, but the final declaration still brings everything together. It includes adjustments, additional income and final figures that determine your actual tax liability.

What if my records are not ready at the end of a quarter?

You can still submit, but incomplete records increase the chances of errors and corrections later. If this happens repeatedly, each quarter becomes harder to manage rather than easier.

Does MTD change how much tax I pay?

No, it does not change tax rates or calculation rules. It only changes how frequently you report your financial data and how your records need to be maintained.

Why is gross income used instead of profit?

Gross income gives HMRC a consistent way to assess eligibility without relying on how expenses are calculated. This avoids variations in how profit is reported.

Can I continue with my current way of working?

Only if your current process supports regular, accurate record updates. If it relies on year-end preparation, it will need to be adjusted to meet MTD requirements.